Bearing residual magnetism eliminating device and bearing demagnetization method

Abstract

This application provides a bearing residual magnetism elimination device and a bearing demagnetization method, belonging to the field of bearing demagnetization equipment. The device includes a frame, a demagnetizing cover, and a rotary drive assembly. The frame is equipped with a support base, a lifting seat, and a lifting drive assembly. The support base is fixed to the lower part of the frame to support the bearing to be demagnetized. The lifting drive assembly can drive the lifting seat to move up and down at a uniform speed. The demagnetizing cover is located on the lifting seat and coaxially arranged with the support base. Multiple strong magnetic blocks with irregularly distributed magnetic poles are arranged circumferentially on its inner circumferential wall. The rotary drive assembly is located on the lifting seat and can drive the demagnetizing cover to rotate uniformly around its own axis, forming a continuously changing rotating magnetic field inside. During operation, the rotation and lifting of the demagnetizing cover are synchronized, causing the bearing to be demagnetized to be subjected to a magnetic field with changing direction and gradually decreasing amplitude, thus achieving demagnetization. The bearing residual magnetism elimination device and bearing demagnetization method provided by this invention provide a uniform demagnetizing magnetic field with a controllable gradual change in amplitude, effectively eliminating bearing residual magnetism.

Description

Technical Field

[0001] This invention belongs to the technical field of bearing demagnetizing equipment, and more specifically, it relates to a bearing residual magnetism elimination device and a bearing demagnetization method. Background Technology

[0002] Medium and large bearings are widely used in industrial equipment such as wind power, metallurgy, mining, and heavy machinery. They are core components that ensure the rotational accuracy of equipment. After the bearing is processed and assembled, its metal components such as rings and rolling elements will retain residual magnetism due to magnetization during processing and contact with magnetic tooling. The presence of residual magnetism will attract metal impurities such as iron filings and abrasive particles, which will aggravate bearing wear, reduce service life, and interfere with the normal operation of supporting electrical and detection components. Therefore, bearings must be demagnetized to meet the factory quality requirements.

[0003] In the existing technology, the demagnetization of medium and large bearings mainly relies on workers using handheld demagnetizers. During the operation, the workers hold the demagnetizer close to the bearing surface and gradually move it along the circumference and end face of the bearing to scan it. The alternating magnetic field generated by the demagnetizer gradually cancels the residual magnetism inside the bearing, thereby eliminating the residual magnetism of the bearing.

[0004] The above-mentioned handheld demagnetization method has many technical problems in practical applications: On the one hand, medium and large bearings are large in size and heavy in weight, and manual operation of handheld devices area by area is time-consuming and laborious, resulting in low demagnetization efficiency. Moreover, it is difficult to maintain uniformity in the movement speed and scanning path of manual operation, which can easily lead to demagnetization blind spots. On the other hand, the magnetic field depth and coverage of handheld demagnetizers are limited, making it difficult to form a sufficient magnetic field on the deep structures such as the raceways and rolling element gaps inside the bearing. This results in poor demagnetization uniformity, incomplete demagnetization, and difficulty in consistently achieving the residual magnetism control standard for medium and large bearings. Summary of the Invention

[0005] The purpose of this application is to provide a bearing residual magnetism elimination device and a bearing demagnetization method to solve the technical problems of low work efficiency, high labor intensity, poor demagnetization uniformity and incomplete demagnetization when using a handheld demagnetizer to demagnetize medium and large bearings in the prior art.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: A bearing residual magnetism elimination device is provided, comprising: A frame; the frame is provided with a bearing base and a lifting seat; the bearing base is fixedly installed at the lower part of the frame to support the bearing to be demagnetized; the lifting seat is slidably connected to the frame in the vertical direction; the frame is also provided with a lifting drive assembly, which is connected to the lifting seat in a transmission manner to drive the lifting seat to move at a uniform speed in the vertical direction; The demagnetizing cover adopts a cylindrical structure with an open bottom; the demagnetizing cover is mounted on the lifting seat and coaxially arranged with the supporting base; multiple strong magnetic blocks are arranged circumferentially at intervals on the inner peripheral wall of the demagnetizing cover, and the magnetic poles of the multiple strong magnetic blocks are irregularly distributed; and A rotary drive assembly is mounted on the lifting seat and is connected to the demagnetizing cover to drive the demagnetizing cover to rotate at a constant speed around its own axis, thereby forming a rotating magnetic field with a continuously changing magnetic field direction in the internal region of the demagnetizing cover. Specifically, when the rotary drive assembly drives the demagnetizing cover to rotate at a constant speed, the lifting drive assembly is simultaneously activated to drive the demagnetizing cover to move upward at a constant speed, so that the bearing to be demagnetized is subjected to a magnetic field with a continuously changing magnetic field direction and a gradually decreasing magnetic field amplitude, thereby achieving the demagnetization of the bearing.

[0007] In one possible implementation, the magnetic poles of two adjacent strong magnetic blocks are oriented differently, and the magnetic pole orientation is randomly selected from radially inward, axially upward, axially downward, and inclined inward, so as to form a demagnetizing magnetic field with irregularly distributed magnetic poles inside the demagnetizing cover.

[0008] In one possible implementation, the plurality of strong magnetic blocks are distributed at unequal intervals along the inner peripheral wall of the demagnetizing cover, and the plurality of strong magnetic blocks are arranged in at least two staggered rows along the axial direction of the demagnetizing cover.

[0009] In one possible implementation, the lifting drive component includes: The transmission screw is rotatably connected to the frame in the up-down direction; A transmission seat is fixedly connected to the lifting seat, and the transmission seat has a threaded hole for threaded connection with the transmission screw; and A first motor is mounted on the frame, and the output shaft of the first motor is coaxially and fixedly connected to one end of the transmission screw.

[0010] In one possible implementation, a guide member is provided between the transmission base and the frame; the guide member includes: Guide grooves are formed on the frame in the vertical direction; and A guide plate is disposed on the transmission seat, and the guide plate is slidably connected to the guide groove in the vertical direction.

[0011] In one possible implementation, the rotation drive component includes: A connecting plate is rotatably connected to the lifting base in a horizontal direction, and the lower end of the connecting plate is connected to the demagnetizing cover; and A second motor is mounted on the lifting base, and the output shaft of the second motor is coaxially and fixedly connected to the upper end of the connecting plate.

[0012] In one possible implementation, the bearing side of the bearing base is provided with a clamping mechanism; the clamping mechanism includes: A double-ended screw is rotatably connected to the bearing base in a horizontal direction; the double-ended screw has two threaded portions symmetrically arranged axially, and the thread directions of the two threaded portions are opposite; and Both clamping plates are slidably connected to the bearing base along the axial direction of the double-ended screw, and the two clamping plates are respectively threaded to the two threaded parts; the adjacent sides of the two clamping plates are used to abut against the outer wall of the bearing to be demagnetized; When the double-ended screw is rotated, the two clamping plates are adapted to move synchronously towards or away from each other.

[0013] In one possible implementation, the bearing base has a hollow internal structure; the bearing surface of the bearing base has multiple air intake holes arranged in an array and communicating with the interior; the bearing base is also provided with a connecting pipe, one end of which communicates with the interior of the bearing base, and the other end is used to connect to a negative pressure device.

[0014] In practical applications, the bearing residual magnetism elimination device provided in this application first places the bearing to be demagnetized coaxially on the support base at the bottom of the frame to complete the positioning. Then, the lifting drive component outputs power to drive the lifting seat to slide along the vertical direction of the frame, thereby driving the demagnetizing cover to descend to the periphery of the bearing to be demagnetized, so that the entire bearing to be demagnetized is placed in the inner cavity of the demagnetizing cover.

[0015] Then, the rotation drive assembly is activated, causing the demagnetizing cover to rotate at a constant speed around its own axis. Multiple strong magnetic blocks set on the inner circumferential wall of the demagnetizing cover rotate synchronously with the demagnetizing cover, forming a continuously changing demagnetizing magnetic field around the bearing to be demagnetized, which gradually cancels out the residual magnetism inside the bearing.

[0016] During this process, the lifting drive assembly synchronously drives the lifting seat to raise the demagnetizing cover at a uniform speed along the axial direction, so that the demagnetizing cover gradually moves away from the bearing to be demagnetized. The magnetic field amplitude at the location of the bearing to be demagnetized continues to decrease as the distance increases until the demagnetizing cover rises to the preset termination position. Then, the operation of the rotation drive assembly and the lifting drive assembly stops, completing the entire bearing residual magnetism removal operation.

[0017] Compared with the prior art, the bearing residual magnetism elimination device provided in this application adopts a mechanized and automated structural design to replace manual handheld demagnetization operations. Through the coordinated cooperation of the lifting drive component and the rotating drive component, the demagnetization process is made uniform and controllable, which effectively reduces the labor intensity of operators and improves the processing efficiency of medium and large bearing demagnetization operations.

[0018] Meanwhile, the circumferentially arranged strong magnetic blocks rotate with the demagnetizing cover and work in conjunction with the axial lifting mechanism to create a comprehensive and uniformly changing alternating magnetic field environment around the bearing. This environment can provide sufficient magnetic field coverage for all structural parts of the bearing, such as the end face, raceway, and rolling elements. This avoids the blind spots and uneven magnetic field effects that are common with manual operation, and improves the uniformity and thoroughness of demagnetization in all parts of the bearing. It can stably meet the residual magnetism control standards for medium and large bearings.

[0019] The technical solution adopted in this application also provides a bearing demagnetization method, and a bearing residual magnetism elimination device based on any one of the foregoing contents, comprising the following steps: S1. Place the bearing to be demagnetized coaxially on the bearing base, and control the lifting drive assembly to drive the demagnetizing cover to descend to the initial position, so that the bearing to be demagnetized is located in the inner cavity of the demagnetizing cover, and the axial coverage of the strong magnetic block completely covers the axial height of the bearing to be demagnetized. S2. Start the rotary drive assembly to drive the demagnetizing cover to rotate uniformly around its own axis at a preset speed, forming a rotating alternating magnetic field around the bearing to be demagnetized. S3. Synchronously start the lifting drive component, drive the lifting seat to move the demagnetizing cover upward at a preset speed in the vertical direction, so that the demagnetizing cover gradually moves away from the bearing to be demagnetized, and the magnetic field amplitude at the bearing to be demagnetized gradually decreases as the distance increases. S4. When the demagnetizing cover moves upward to the termination position, stop the rotation drive assembly and the lifting drive assembly to complete the bearing demagnetization.

[0020] In one possible implementation, the rotational speed of the demagnetizing shield in step S2 and the axial upward speed of the demagnetizing shield in step S3 satisfy a preset matching relationship: During the entire process of the demagnetizing cover rising from the initial position to the final position, the magnetic field direction experienced by any radial section position of the bearing to be demagnetized alternates no less than 12 times.

[0021] The beneficial effects of the bearing demagnetization method provided in this embodiment are the same as those of the aforementioned bearing residual magnetism elimination device, and will not be repeated here. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1A three-dimensional structural diagram of the bearing residual magnetism elimination device provided in an embodiment of the present invention. Figure 1 ; Figure 2 A three-dimensional structural diagram of the bearing residual magnetism elimination device provided in an embodiment of the present invention. Figure 2 ; Figure 3 This is a side view of the bearing residual magnetism elimination device provided in an embodiment of the present invention; Figure 4 This is a top view of the bearing residual magnetism elimination device provided in an embodiment of the present invention; Figure 5 For along Figure 3 Schematic diagram of the cross-sectional structure along line AA; Figure 6 For along Figure 4 Schematic diagram of the cross-sectional structure of the middle BB line.

[0024] The following are the labeling elements in the figure: 1. Frame; 2. Support base; 21. Air intake hole; 22. Connecting pipe; 3. Lifting seat; 4. Demagnetizing cover; 5. Strong magnetic block; 61. Transmission screw; 62. Transmission seat; 63. First motor; 7. Guide component; 71. Guide groove; 72. Guide plate; 8. Rotary drive assembly; 81. Connecting plate; 82. Second motor; 9. Clamping mechanism; 91. Double-ended screw; 92. Clamping plate; 100. Bearing to be demagnetized. Detailed Implementation

[0025] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0026] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0027] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] Please refer to the following: Figures 1 to 6 The bearing residual magnetism elimination device provided in this application will now be described. The bearing residual magnetism elimination device includes a frame 1, a demagnetizing cover 4, and a rotary drive assembly 8.

[0030] Both the frame 1 and the demagnetizing cover 4 can be made of non-metallic materials; the frame 1 is provided with a bearing base 2 and a lifting seat 3; the bearing base 2 is fixedly installed at the lower part of the frame 1 to support the bearing 100 to be demagnetized; the lifting seat 3 is slidably connected to the frame 1 in the vertical direction; the frame 1 is also provided with a lifting drive assembly, which is connected to the lifting seat 3 in a transmission manner to drive the lifting seat 3 to move at a uniform speed in the vertical direction.

[0031] The demagnetizing cover 4 adopts a cylindrical structure with an open bottom; the demagnetizing cover 4 is set on the lifting seat 3 and is arranged coaxially with the bearing base 2; multiple strong magnetic blocks 5 are arranged at intervals along the circumferential direction on the inner peripheral wall of the demagnetizing cover 4, and the magnetic poles of the multiple strong magnetic blocks 5 are irregularly distributed.

[0032] The rotary drive assembly 8 is mounted on the lifting seat 3 and is connected to the demagnetizing cover 4 in a transmission manner to drive the demagnetizing cover 4 to rotate at a constant speed around its own axis, so as to form a rotating magnetic field with a continuously changing magnetic field direction in the internal region of the demagnetizing cover 4.

[0033] When the rotary drive assembly 8 drives the demagnetizing cover 4 to rotate at a constant speed, the lifting drive assembly is activated simultaneously to drive the demagnetizing cover 4 to move upward at a constant speed, so that the bearing to be demagnetized 100 is subjected to a magnetic field with a continuously changing magnetic field direction and a gradually decreasing magnetic field amplitude, so as to achieve the demagnetization of the bearing.

[0034] During operation, the bearing to be demagnetized 100 is first placed on the support base 2 at the bottom of the frame 1 for positioning. Then, the lifting drive assembly outputs power to drive the lifting seat 3, which is slidably connected to the frame 1, to move downward in the vertical direction, thereby moving the demagnetizing cover 4 to the corresponding position on the periphery of the bearing to be demagnetized 100. After the position is in place, the rotation drive assembly 8 and the lifting drive assembly are started simultaneously. The rotation drive assembly 8 drives the demagnetizing cover 4 to rotate at a constant speed around its own axis. At the same time, the lifting drive assembly drives the lifting seat 3 and the demagnetizing cover 4 to move upward at a constant speed until the demagnetizing cover 4 moves to the preset end position. Then, the two sets of drive assemblies stop at the same time, completing the demagnetization operation of a single bearing.

[0035] It should be further noted that both the rotary drive assembly 8 and the lifting drive assembly are communicatively connected to a controller. Before operation, the controller presets the uniform rotation speed of the rotary drive assembly 8, the uniform lifting speed of the lifting drive assembly, and the initial and final positions of the demagnetizing cover 4. The controller can synchronously send control commands to the rotary drive assembly 8 and the lifting drive assembly, causing them to start simultaneously and operate in coordination. The rotary drive assembly 8 drives the demagnetizing cover 4 to rotate uniformly around its own axis, while the lifting drive assembly drives the lifting seat 3 and the demagnetizing cover 4 to move upwards at a constant speed until the demagnetizing cover 4 moves to the preset final position. The controller then controls both drive assemblies to stop simultaneously, completing the demagnetization operation of a single bearing.

[0036] Demagnetization principle: Multiple strong magnetic blocks 5 (with irregularly distributed magnetic poles) arranged circumferentially on the inner wall of the demagnetizing cover 4 will form a composite magnetic field in the internal space. When the demagnetizing cover 4 rotates at a constant speed around the axis, the direction of the magnetic field at each point inside will continuously change with the position of the magnetic blocks, forming a rotating and changing magnetic field. As the demagnetizing cover 4 rises at a constant speed along the axis, the distance between the bearing to be demagnetized 100 and the strong magnetic blocks 5 will continuously increase. According to the physical law that the magnetic field strength decreases with increasing distance, the magnetic field amplitude at the bearing location will gradually decrease as the demagnetizing cover 4 rises.

[0037] Through the combined effect of continuous alternation of magnetic field direction and slow decay of amplitude, the magnetic domains inside the bearing gradually become disordered during repeated flipping, eventually eliminating residual magnetism. The controller, through communication connection with the two drive components, implements centralized synchronous control of rotation and lifting actions, ensuring that rotation and lifting are strictly synchronized in time and constant and controllable in speed, thereby maintaining a stable coordination between alternation of magnetic field direction and decay of amplitude, and ensuring the uniformity of the demagnetization process.

[0038] A stroke detection sensor can be added to the frame 1 to accurately identify the initial and final positions of the demagnetizing cover 4, thereby achieving automatic control of the lifting stroke. A speed adjustment module can also be added to the lifting drive assembly to allow the lifting speed to be adjusted according to the size and material of the bearing, adapting to the demagnetization requirements of bearings of different specifications. A magnetic induction detection unit can also be added to collect the magnetic field strength data of the bearing position in real time, serving as the basis for adjusting the drive parameters.

[0039] By adopting the above technical solution and using a synchronously coupled rotation and lifting operation mode, a demagnetizing magnetic field with continuously changing direction and uniformly decaying amplitude can be formed in the bearing area, which meets the core requirements of the demagnetizing process. The structure of the demagnetizing cover 4 and the bearing base 2 being arranged coaxially ensures the symmetry of the circumferential magnetic field distribution of the bearing and avoids the occurrence of demagnetizing dead angles. The overall device has a high degree of integration, the operation process is continuous and controllable, and it can stably and effectively eliminate the residual magnetism of the bearing.

[0040] Further, please refer to Figure 6As a specific embodiment of the bearing residual magnetism elimination device provided by the present invention, the magnetic poles of two adjacent strong magnetic blocks 5 are not in the same direction, and the magnetic pole orientation is randomly selected from radial inward, axial upward, axial downward and inclined inward, so as to form a demagnetizing magnetic field with irregular magnetic pole distribution inside the demagnetizing cover 4.

[0041] When assembling the demagnetizing cover 4, multiple strong magnetic blocks 5 are installed sequentially on the inner peripheral wall of the demagnetizing cover 4. During the installation process, the magnetic pole orientation of each strong magnetic block 5 is randomly selected so that the magnetic pole orientations of two adjacent strong magnetic blocks 5 are different from each other. The magnetic pole orientations are randomly arranged in four states: radially inward, axially upward, axially downward, and inclined inward. During the demagnetizing operation, as the demagnetizing cover 4 rotates at a uniform speed, the magnetic poles with different orientations sweep across the outer area of ​​the bearing in sequence.

[0042] Strong magnetic blocks 5 with different orientations will generate magnetic field components in different spatial directions. Radial magnetic poles form radial magnetic fields, axial magnetic poles form axial magnetic fields, and inclined magnetic poles form oblique magnetic fields. Magnetic field components in multiple directions are superimposed inside the demagnetizing cover 4 to form a multi-dimensional composite magnetic field. When the demagnetizing cover 4 rotates, the direction of the composite magnetic field rotates synchronously with the position of the magnetic blocks, so that the bearing is not only subjected to circumferential alternating magnetic fields, but also to alternating magnetic fields in multiple directions such as axial, radial, and oblique, which can cover the magnetic domain structure with different orientations inside the bearing.

[0043] Based on the common remanent magnetization characteristics of bearings, the random distribution of magnetic pole orientation can be optimized to appropriately increase the proportion of magnetic poles with a certain orientation; magnetic pads can also be added to the back of some strong magnetic blocks 5, and the magnetic field radiation direction of the corresponding magnetic pole can be changed by adjusting the magnetic circuit to further enrich the directional dimension of the internal magnetic field.

[0044] By adopting the above technical solution, the limitation that a single magnetic pole orientation can only generate a unidirectional alternating magnetic field is overcome. Through the irregular multidirectional arrangement of magnetic poles, an omnidirectional alternating demagnetizing magnetic field is formed, which can effectively eliminate residual magnetism in different orientations inside the bearing, avoid local residual magnetism caused by unidirectional demagnetization, and improve the thoroughness and uniformity of demagnetization.

[0045] Further, please refer to Figure 6 As a specific embodiment of the bearing residual magnetism elimination device provided by the present invention, a plurality of strong magnetic blocks 5 are distributed at unequal intervals along the inner peripheral wall of the demagnetizing cover 4, and the plurality of strong magnetic blocks 5 are arranged in at least two rows in an alternating manner along the axial direction of the demagnetizing cover 4.

[0046] When arranging the strong magnetic blocks 5, a single row of strong magnetic blocks 5 is installed at unequal intervals along the inner circumferential wall of the demagnetizing cover 4. At the same time, at least two rows of strong magnetic blocks 5 are arranged along the axial direction of the demagnetizing cover 4, and the upper and lower rows of strong magnetic blocks 5 are staggered in the circumferential position. During the demagnetization operation, as the demagnetizing cover 4 rotates, the magnetic blocks with unequal intervals form a circumferential magnetic field with varying density, and the multiple rows of staggered magnetic blocks form a composite magnetic field with axial superposition, which together act on the bearing 100 to be demagnetized.

[0047] The unequal spacing of the five strong magnetic blocks avoids the periodic magnetic field stagnation points generated when they are equally spaced, eliminates the blind zone of magnetic field uniformity in the circumferential direction, and ensures that all positions in the circumferential direction of the bearing are subjected to sufficient alternating magnetic field. The structure of multiple rows of staggered arrangement in the axial direction can form a continuous magnetic field coverage in the axial direction. At the same time, the phase difference between the upper and lower rows of magnetic blocks will cause the magnetic field changes at different positions in the axial direction to form a staggered superposition, which enhances the alternating magnetic field effect in the axial range and avoids the occurrence of demagnetized weak areas at both ends of the bearing in the axial direction.

[0048] The strong magnetic block 5 can be set to a multi-row staggered structure of three or more rows to further improve the uniformity of the axial magnetic field distribution; different rows of strong magnetic blocks 5 can also use different magnetic field intensities to form an axial gradient magnetic field to meet the demagnetization requirements of bearings of different heights and sizes.

[0049] By adopting the above technical solution, the arrangement of the strong magnetic blocks 5 is optimized from two dimensions: circumferential spacing and axial arrangement. This not only weakens the periodic stagnation points of the circumferential magnetic field, but also improves the magnetic field coverage and alternation effect across the entire axial height. This effectively reduces the problem of insufficient demagnetization in local areas of the bearing and improves the consistency of the overall demagnetization quality of the bearing.

[0050] Further, please refer to Figures 1 to 5 As a specific embodiment of the bearing residual magnetism elimination device provided by the present invention, the lifting drive assembly includes a transmission screw 61, a transmission seat 62 and a first motor 63.

[0051] The transmission screw 61 is rotatably connected to the frame 1 in the up-down direction.

[0052] The transmission seat 62 is fixedly connected to the lifting seat 3, and the transmission seat 62 has a threaded hole that is threadedly connected to the transmission screw 61.

[0053] The first motor 63 is mounted on the frame 1, and the output shaft of the first motor 63 is coaxially and fixedly connected to one end of the transmission screw 61.

[0054] When the lifting drive is in operation, the first motor 63 is powered on and started. The output shaft drives the transmission screw 61 to rotate at a constant speed around its own axis. The transmission screw 61 and the threaded hole of the transmission seat 62 form a helical transmission pair. The rotating transmission screw 61 converts the rotational motion into the linear motion of the transmission seat 62, which in turn drives the lifting seat 3 to move at a constant speed along the vertical direction of the frame 1 through the transmission seat 62, thereby realizing the lifting action of the demagnetizing cover 4.

[0055] Based on the working principle of screw and nut transmission, motion and power are transmitted through the meshing of the threaded pair, and the rotational motion of the motor is precisely converted into the linear motion of the lifting seat 3. The transmission ratio of the threaded transmission is constant, which can ensure that the moving speed of the lifting seat 3 is uniform and stable, so that the rising process of the demagnetizing cover 4 is kept at a uniform speed, thereby ensuring that the attenuation process of the magnetic field amplitude at the bearing is uniform and linear, which meets the requirements of the demagnetizing process for the gradual change of the magnetic field.

[0056] The ordinary transmission screw 61 can be replaced with a ball screw to reduce transmission friction resistance and improve transmission efficiency and smoothness of movement; a reduction mechanism can also be added between the first motor 63 and the transmission screw 61 to increase output torque by reducing speed, which can meet the lifting requirements of heavy demagnetizing cover 4; a braking unit can also be added to lock the lifting position when the power is off to prevent demagnetizing cover 4 from falling.

[0057] By adopting the above technical solution and using a screw-driven lifting structure, the transmission accuracy is high and the speed stability is good. It can accurately control the lifting speed and position of the demagnetizing cover 4, ensuring that the magnetic field amplitude decays uniformly according to the preset law. At the same time, the structure has strong load-bearing capacity and reliable transmission, which can adapt to the load requirements of demagnetizing devices of different specifications, and improve the stability and controllability of the device operation.

[0058] Further, please refer to Figures 1 to 5 As a specific embodiment of the bearing residual magnetism elimination device provided by the present invention, a guide member 7 is provided between the transmission seat 62 and the frame 1; the guide member 7 includes a guide groove 71 and a guide plate 72.

[0059] The guide groove 71 is formed on the frame 1 in the vertical direction.

[0060] The guide plate 72 is mounted on the transmission seat 62 and is slidably connected to the guide groove 71 in the vertical direction.

[0061] During assembly, a guide groove 71 is machined on the frame 1 along the vertical direction, and a guide plate 72 is installed at the corresponding position on the transmission seat 62 so that the guide plate 72 is embedded in the guide groove 71. During the lifting operation, the rotation tendency of the transmission seat 62 as it rotates with the transmission screw 61 is constrained by the cooperation between the guide plate 72 and the guide groove 71, so that it can only move vertically along the extension direction of the guide groove 71, thereby driving the lifting seat 3 to complete precise lifting.

[0062] The guide groove 71 and the guide plate 72 form a sliding pair structure. The rotational and radial offset degrees of freedom of the transmission seat 62 are restricted by the constraint of the contact surface, and only the axial movement degree of freedom is retained. This structure can counteract the circumferential force generated during the screw transmission process, prevent the transmission seat 62 from rotating synchronously with the screw, and prevent the lifting seat 3 and the demagnetizing cover 4 from radially swaying, ensuring that the demagnetizing cover 4 always moves in a straight line along the axial direction.

[0063] The slotted guide structure can be replaced with a linear guide pair to further improve the guiding accuracy and smoothness of movement; wear-resistant lining strips can also be added to the contact surface between the guide plate 72 and the guide groove 71 to reduce wear and extend the service life of the equipment; a guide clearance adjustment structure can also be added to compensate for the clearance after long-term use and ensure guiding accuracy.

[0064] By adopting the above technical solution and adding the guide component 7, the straightness and stability of the lifting motion are improved, the problem of the demagnetizing cover 4 tilting and shaking during the lifting process is reduced, the coaxiality of the demagnetizing cover 4, the bearing base 2, and the bearing to be demagnetized 100 is improved, and the uneven demagnetization of the bearing in the circumferential direction due to the magnetic field eccentricity is prevented, thereby further improving the stability of the demagnetization quality.

[0065] Further, please refer to Figures 1 to 4 As a specific embodiment of the bearing residual magnetism elimination device provided by the present invention, the rotary drive assembly 8 includes a connecting disk 81 and a second motor 82.

[0066] The connecting plate 81 is rotatably connected to the lifting base 3 in the horizontal direction, and the lower end of the connecting plate 81 is connected to the demagnetizing cover 4.

[0067] The second motor 82 is mounted on the lifting seat 3, and the output shaft of the second motor 82 is coaxially and fixedly connected to the upper end of the connecting plate 81.

[0068] During rotary drive operation, the second motor 82 starts and outputs torque at a constant speed. The power is transmitted to the connecting plate 81 through the output shaft, causing the connecting plate 81 to rotate at a constant speed around the axis in the horizontal direction on the lifting seat 3. Then, through the connecting structure at the lower end of the connecting plate 81, the demagnetizing cover 4 is driven to rotate at a constant speed around its own axis, forming a stable rotating magnetic field.

[0069] By adopting a coaxial direct drive method, the output shaft of the second motor 82 coincides with the axes of the connecting plate 81 and the demagnetizing cover 4. There is no change in direction or eccentric transmission during power transmission, which can ensure that the rotational angular velocity of the demagnetizing cover 4 is uniform and stable. The connecting plate 81, as an intermediate transmission component, can transmit rotational torque and increase the connection area with the demagnetizing cover 4, thereby improving the reliability of the connection and the smoothness of rotation.

[0070] An elastic buffer can be added to the connection between the connecting plate 81 and the demagnetizing cover 4 to absorb vibration and impact during rotation and reduce operating noise; the direct drive structure can be replaced with a synchronous belt drive structure to isolate the influence of motor vibration on the demagnetizing cover 4 and further improve rotational stability; a dynamic balancing structure can also be added to the connecting plate 81 to reduce vibration during high-speed rotation.

[0071] By adopting the above technical solution, the coaxial rotary drive structure has high transmission efficiency and good rotational stability, which can ensure that the demagnetizing cover 4 rotates at a constant angular velocity, making the frequency of the internal rotating magnetic field stable and uniform, and avoiding the uneven magnetic field alternation caused by speed fluctuation; at the same time, the structure is simple and compact, easy to assemble and maintain, and has high operational reliability.

[0072] Further, please refer to Figures 1 to 4 and Figure 6 As a specific embodiment of the bearing residual magnetism elimination device provided by the present invention, the bearing base 2 is provided with a clamping mechanism 9 on the bearing side; the clamping mechanism 9 includes a double-headed screw 91 and two clamping plates 92.

[0073] The double-ended screw 91 is rotatably connected to the bearing base 2 in the horizontal direction; the double-ended screw 91 has two threaded parts symmetrically arranged in the axial direction, and the thread directions of the two threaded parts are opposite.

[0074] Both clamping plates 92 are slidably connected to the bearing base 2 along the axial direction of the double-ended screw 91, and the two clamping plates 92 are respectively threaded to the two threaded parts; the adjacent sides of the two clamping plates 92 are used to abut against the outer wall of the bearing to be demagnetized 100.

[0075] When the double-headed screw 91 is rotated, the two clamping plates 92 are adapted to move synchronously towards or away from each other.

[0076] When clamping the bearing, rotate the double-ended screw 91 on the bearing base 2. Since the threads of the two threads on the double-ended screw 91 are opposite, the two clamping plates 92, which are threaded to the corresponding threads, will move synchronously towards each other along the axial direction of the double-ended screw 91 until the inner sides of the two clamping plates 92 abut against the outer wall of the demagnetizing bearing 100, thus completing the centering and clamping of the bearing. After demagnetization is completed, rotate the double-ended screw 91 in the opposite direction, and the two clamping plates 92 will move synchronously in opposite directions. The bearing can then be released and the workpiece can be removed.

[0077] Based on the forward and reverse thread transmission principle of the double-ended screw 91, the two reverse threads on the same screw can convert a single rotational input into synchronous opposing motion of two clamping plates 92, ensuring that the moving distance of the two clamping plates 92 is always equal, realizing automatic centering and clamping of the bearing, and ensuring that the axis of the bearing coincides with the axis of the demagnetizing cover 4 after clamping; at the same time, the thread transmission has a self-locking characteristic, and can maintain a stable clamping force after clamping, without the need for an additional locking structure.

[0078] A rubber or copper anti-slip pad can be added to the inner side of the clamping plate 92 to prevent damage to the precision outer wall of the bearing during clamping, while increasing friction to improve clamping reliability; a drive motor and transmission mechanism can also be configured to drive the double-headed screw 91 to rotate, realizing automatic clamping and loosening, which is suitable for automated batch demagnetization production lines; a pressure sensor can also be added to monitor the clamping force in real time to avoid damaging thin-walled bearings.

[0079] By adopting the above technical solution, the clamping mechanism 9 adopts a synchronous centering structure, which makes the clamping operation simple and quick, and the centering accuracy is high. It can ensure the coaxiality of the bearing and the demagnetizing cover 4 and avoid uneven demagnetization caused by clamping misalignment. At the same time, the movement of the clamping plate 92 can adapt to bearings with different outer diameters. The device has strong versatility, and the thread self-locking feature ensures the stability and reliability of the clamping state.

[0080] Further, please refer to Figures 1 to 4 As a specific embodiment of the bearing residual magnetism elimination device provided by the present invention, the bearing base 2 adopts an internally hollow structure; the bearing surface of the bearing base 2 has multiple air intake holes 21 arranged in an array and communicating with the interior; the bearing base 2 is also provided with a connecting pipe 22, one end of which is connected to the interior of the bearing base 2, and the other end is used to connect to a negative pressure device.

[0081] During the demagnetization process, the negative pressure equipment connected to the connecting pipe 22 is continuously running. Through the connecting pipe 22, air is continuously drawn into the hollow cavity of the bearing base 2, creating a stable negative pressure environment inside the cavity. External air carrying detached debris continuously flows into the cavity through multiple air intake holes 21 arranged in an array on the bearing surface. During the bearing demagnetization process, metal debris that falls off the surface is drawn into the bearing base 2 along with the airflow through the air intake holes 21, and then enters the collection unit of the negative pressure equipment through the connecting pipe 22 to be collected. The negative pressure suction state is maintained throughout the demagnetization process. After the operation is completed, the negative pressure equipment is turned off, and the collected metal debris is cleaned periodically.

[0082] During the alternating magnetic field process of bearing processing, transportation, and demagnetization, metal debris such as iron filings and abrasive particles are easily attached to or detached from the surface of the bearing. If these remain on the bearing working surface or inside the equipment, they can easily cause scratches on the bearing surface or jamming of moving parts of the equipment. The negative pressure environment inside the bearing base 2 creates a pressure difference with the external atmospheric pressure, forming an airflow that flows into the cavity at each suction hole 21. This can promptly carry away the loosened and detached metal debris during the demagnetization process. The array-distributed suction holes 21 cover the entire bearing area, enabling full-range debris suction under the bearing and preventing debris residue.

[0083] An annular guide groove can be added to the outer periphery of the bearing surface of the bearing base 2 to form a concentrated airflow in conjunction with the negative pressure of the suction hole 21, preventing debris from splashing and falling to the outside of the equipment; a pressure detection module can also be set in the negative pressure circuit, which will automatically issue a cleaning warning signal when the suction hole 21 is blocked and the negative pressure value is abnormal.

[0084] By adopting the above technical solution, the negative pressure structure of the bearing base 2 is used for real-time cleaning of demagnetized debris. It can remove the detached metal debris simultaneously during the demagnetization operation, avoid the metal debris from scratching the precision working surface of the bearing, improve the surface quality and assembly accuracy of the bearing, and prevent debris from accumulating in the equipment movement gap, causing jamming and wear, thus extending the service life and maintenance cycle of the equipment. Moreover, the suction structure does not interfere with the positioning and fixing structure of the bearing, and does not affect the normal placement and demagnetization process of the bearing. It has a high degree of structural integration and strong functional practicality.

[0085] The technical solution adopted in this application also provides a bearing demagnetization method, based on any of the foregoing bearing residual magnetism elimination devices, including the following steps: S1. Place the bearing to be demagnetized 100 coaxially on the bearing base 2, and control the lifting drive assembly to drive the demagnetizing cover 4 to descend to the initial position, so that the bearing to be demagnetized 100 is located in the inner cavity of the demagnetizing cover 4, and the axial coverage of the strong magnetic block 5 completely covers the axial height of the bearing to be demagnetized 100.

[0086] S2. Start the rotary drive assembly 8 to drive the demagnetizing cover 4 to rotate at a preset speed around its own axis, forming a rotating alternating magnetic field around the bearing to be demagnetized 100.

[0087] S3. Synchronously start the lifting drive component, drive the lifting seat 3 to move the demagnetizing cover 4 upward at a preset speed in the vertical direction, so that the demagnetizing cover 4 gradually moves away from the bearing to be demagnetized 100, and the magnetic field amplitude at the bearing to be demagnetized 100 gradually decreases as the distance increases.

[0088] S4. When the demagnetizing cover 4 moves upward to the end position, stop the rotation drive assembly 8 and the lifting drive assembly to complete the bearing demagnetization.

[0089] A residual magnetism detection step can be added after the demagnetization process, using a gaussmeter to detect the residual magnetism of the bearing, and perform secondary demagnetization on substandard workpieces; multiple sets of speed and lifting speed parameter combinations can be preset for bearings of different materials and models, and the corresponding parameters can be called to execute the demagnetization process; a multi-station cycle structure can also be set up to realize continuous automated operation of loading, demagnetization and unloading.

[0090] Furthermore, as a specific embodiment of the bearing residual magnetism elimination device provided by the present invention, the rotational speed of the demagnetizing cover 4 in step S2 and the axial upward speed of the demagnetizing cover 4 in step S3 satisfy a preset matching relationship: During the entire process of the demagnetizing cover 4 rising from the initial position to the final position, the magnetic field direction of any radial section position of the bearing to be demagnetized 100 alternates no less than 12 times.

[0091] The demagnetizing effect of ferromagnetic materials is directly related to the number of magnetic field alternations. Magnetic domains need to undergo a sufficient number of repeated flips to fully break their original ordered arrangement. If the number of alternations is insufficient, some magnetic domains will retain their original orientation, resulting in incomplete elimination of residual magnetism. This parameter matching relationship ensures that each radial section of the bearing is subjected to a sufficient number of alternating magnetic field directions throughout the entire demagnetizing process by limiting the minimum number of alternations, thus ensuring that the magnetic domains are fully flipped and disordered, and guaranteeing that the demagnetizing effect meets the standards from the perspective of process parameters.

[0092] The minimum number of alternation cycles can be adjusted for bearings of different materials. For example, for bearings with high coercivity, the minimum number of alternation cycles can be increased to 16 or 20 to ensure demagnetization. A real-time detection and feedback system can also be added to collect speed and acceleration / deceleration data, calculate the current number of alternation cycles in real time, and automatically adjust the drive parameters when deviations occur.

[0093] By adopting the above technical solution, by clarifying the matching relationship between rotational speed and acceleration / deceleration speed, and by setting the minimum process threshold for the number of magnetic field alternations, the demagnetization failure problem caused by unreasonable speed matching is avoided from the parameter design level, and the demagnetization quality can be stably guaranteed to meet the standards. At the same time, this quantitative indicator facilitates the standardized setting of process parameters, and makes it convenient for process adaptation and quality control of bearings of different specifications.

[0094] The beneficial effects of the bearing demagnetization method provided in this embodiment are the same as those of the aforementioned bearing residual magnetism elimination device, and will not be repeated here.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bearing residual magnetism elimination device, characterized in that, include: frame; The frame is provided with a bearing base and a lifting seat; the bearing base is fixedly installed at the lower part of the frame to support the bearing to be demagnetized; the lifting seat is slidably connected to the frame in the vertical direction; the frame is also provided with a lifting drive assembly, which is connected to the lifting seat in a transmission manner to drive the lifting seat to move at a constant speed in the vertical direction. The demagnetizing cover adopts a cylindrical structure with an open bottom; the demagnetizing cover is mounted on the lifting seat and coaxially arranged with the supporting base; multiple strong magnetic blocks are arranged circumferentially at intervals on the inner peripheral wall of the demagnetizing cover, and the magnetic poles of the multiple strong magnetic blocks are irregularly distributed; and A rotary drive assembly is mounted on the lifting seat and is connected to the demagnetizing cover to drive the demagnetizing cover to rotate at a constant speed around its own axis, thereby forming a rotating magnetic field with a continuously changing magnetic field direction in the internal region of the demagnetizing cover. Specifically, when the rotary drive assembly drives the demagnetizing cover to rotate at a constant speed, the lifting drive assembly is simultaneously activated to drive the demagnetizing cover to move upward at a constant speed, so that the bearing to be demagnetized is subjected to a magnetic field with a continuously changing magnetic field direction and a gradually decreasing magnetic field amplitude, thereby achieving the demagnetization of the bearing.

2. The bearing residual magnetism elimination device as described in claim 1, characterized in that, The magnetic poles of two adjacent strong magnetic blocks are oriented differently, and the magnetic pole orientation is randomly selected from radially inward, axially upward, axially downward, and inclined inward, so as to form an irregularly distributed demagnetizing magnetic field inside the demagnetizing cover.

3. The bearing residual magnetism elimination device as described in claim 1, characterized in that, The plurality of strong magnetic blocks are distributed at unequal intervals along the inner peripheral wall of the demagnetizing cover, and the plurality of strong magnetic blocks are arranged in at least two staggered rows along the axial direction of the demagnetizing cover.

4. The bearing residual magnetism elimination device as described in claim 1, characterized in that, The lifting drive component includes: The transmission screw is rotatably connected to the frame in the up-down direction; A transmission seat is fixedly connected to the lifting seat, and the transmission seat has a threaded hole for threaded connection with the transmission screw; and A first motor is mounted on the frame, and the output shaft of the first motor is coaxially and fixedly connected to one end of the transmission screw.

5. The bearing residual magnetism elimination device as described in claim 4, characterized in that, A guide member is provided between the transmission base and the frame; the guide member includes: Guide grooves are formed on the frame in the vertical direction; and A guide plate is disposed on the transmission seat, and the guide plate is slidably connected to the guide groove in the vertical direction.

6. The bearing residual magnetism elimination device as described in claim 1, characterized in that, The rotation drive assembly includes: A connecting plate is rotatably connected to the lifting base in a horizontal direction, and the lower end of the connecting plate is connected to the demagnetizing cover; and A second motor is mounted on the lifting base, and the output shaft of the second motor is coaxially and fixedly connected to the upper end of the connecting plate.

7. The bearing residual magnetism elimination device as described in claim 1, characterized in that, The bearing base is provided with a clamping mechanism on its bearing side; the clamping mechanism includes: A double-ended screw is rotatably connected to the bearing base in a horizontal direction; the double-ended screw has two threaded portions symmetrically arranged axially, and the thread directions of the two threaded portions are opposite; and Both clamping plates are slidably connected to the bearing base along the axial direction of the double-ended screw, and the two clamping plates are respectively threaded to the two threaded parts; the adjacent sides of the two clamping plates are used to abut against the outer wall of the bearing to be demagnetized; When the double-ended screw is rotated, the two clamping plates are adapted to move synchronously towards or away from each other.

8. The bearing residual magnetism elimination device as described in claim 1, characterized in that, The bearing base has a hollow internal structure; the bearing surface of the bearing base has multiple air intake holes arranged in an array and communicating with the interior; the bearing base is also provided with a connecting pipe, one end of which communicates with the interior of the bearing base, and the other end is used to connect to a negative pressure device.

9. A bearing demagnetization method, characterized in that, The bearing residual magnetism elimination device according to any one of claims 1-8 includes the following steps: S1. Place the bearing to be demagnetized coaxially on the bearing base, and control the lifting drive assembly to drive the demagnetizing cover to descend to the initial position, so that the bearing to be demagnetized is located in the inner cavity of the demagnetizing cover, and the axial coverage of the strong magnetic block completely covers the axial height of the bearing to be demagnetized. S2. Start the rotary drive assembly to drive the demagnetizing cover to rotate uniformly around its own axis at a preset speed, forming a rotating alternating magnetic field around the bearing to be demagnetized. S3. Synchronously start the lifting drive component, drive the lifting seat to move the demagnetizing cover upward at a preset speed in the vertical direction, so that the demagnetizing cover gradually moves away from the bearing to be demagnetized, and the magnetic field amplitude at the bearing to be demagnetized gradually decreases as the distance increases. S4. When the demagnetizing cover moves upward to the termination position, stop the rotation drive assembly and the lifting drive assembly to complete the bearing demagnetization.

10. The bearing demagnetization method as described in claim 9, characterized in that, The rotational speed of the demagnetizing cover in step S2 and the axial upward speed of the demagnetizing cover in step S3 satisfy a preset matching relationship: During the entire process of the demagnetizing cover rising from the initial position to the final position, the magnetic field direction experienced by any radial section position of the bearing to be demagnetized alternates no less than 12 times.

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